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Biomedical subjects

W Irnich

Publications and source records attributed to W Irnich.

At least 91 records · Page 5Linked to original sources
PubMed1976

[Influence of radio and television sets on implanted cardiac pacemakers (author's transl)].

Investigations done on implanted pacemakers with a low threshold against extraneous signals and in-vitro tests under suitable conditions both showed that pacemaker wearers may go near television and accessories such as ultrsound distant control or flexless infrared ear phones without any danger. Radio and television sets are fitted to an increasing degree with electronic sensor switches which initiate various functions after a slight touch. This satisfies present regulations of German Electrical Engineers concerning permitted contact currents. However, pacemaker patients can cause impulse defects by use of sensor switches provided the contact current is less than 25 muA. Sensor technique will in the future be introduced for everyday use on a large scale. Therefore, pacemaker patients should be alerted to the possibilities of an influence, and industry should be made to reduce contact currents in sensors to values below 20 muA.

Infrared Rays↗
PubMed1976

[Left persisting, singular superior vena cava and pacemaker electrode implantation by right cephalic vein].

We are reporting on a case of a singular left upper vena cava with an outlet into the right atrium by a large sinus coronarius (that means, the right vena cava is lacking totally). In spite of the well-known anomaly of the upper vena cava, we successfully implanted a stimulating electrode by the typical access through the right vena cephalica through the right sinus coronarius into the right ventricle. Except of a thrombosis of the rightsided deep venous system of the arm, no complications were to be complained within sixteen months. We know from literature, that within four more cases this transvenous access has been used in pacemaker-therapy. Various complications have been discussed. Before definately implanting an electrode, one should secure severely, if there is any special anomaly of the upper vena cava. In case of the here described, but very rare anomaly of the vana cava, it is to be examined thoroughly, whether an implantation of a transvenous electrode is indicated or, eventually, a myocardial implantation should be preferred.

Female↗
PubMed1975

[Localization of the conduction defect in complete A-V block by means of His bundle electrograms (author's transl)].

The localization of the conduction defect in so-called complete A-V block can be established by electrocardiography only indirectly and unreliably. In principle the region of the atrio-ventricular junction, i.e. the A-V node and the bundle of His, may be involved just as well as the two branches. Analysis of the configuration of the QRS complex in the electrocardiogram is unreliable, particularly in cases with bundle branch block, because any pattern can arise from the appropriate site of a tertiary focus of stimulation in one of the two ventricles. Recording His bundle potentials (His bundle electrogram) enables differentiation. In eleven personal observations and 151 cases collected from the literature of complete A-V block the analysis with this method showed that the so-called A-V block in the majority of cases (63%) is actually due to bilateral bundle branch block. In the other 37% an A-V junctional block was present. This type of block could be differentiated by means of His bundle electrograms into an A-V nodal block and His bundle block.

Adult↗